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- W1990448060 abstract "An ordered hexagonal lattice structure with a lattice constant of about 7nm was reconstituted from outer membrane protein O-8 and/or O-9 and lipopolysaccharide [H. Yamada and S. Mizushima, J. Bacteriol. 135, 1024–1031 (1978)]. Using this reconstitution system, the interaction between O-8 and lipopolysaccharide was studied and the following results were obtained. At least one lipopolysaccharide molecule per one O-8 trimer was required for the hexagonal lattice formation. The lattice constant of the hexagonal lattice formed under the conditions was about 6.5 nm. In the presence of a larger amount of lipopolysaccharide, the lattice constant increased to 7.5 nm, being almost the same as that observed in the dodecylsulfate-treated cell envelope. The lattice constant observed with the heptoseless lipopolysaccharide was also 6.5 nm when the lipopolysaccharide/O-8 ratio was low. Although the increase of the lattice constant was observed upon further addition of the lipopolysaccharide, it was appreciably smaller than that with the wild-type lipopolysaccharide. A hexagonal lattice was also formed when lipopolysaccharide was replaced by an equivalent amount of lipid A or even fatty acids. The lattice constant was the same as that with the wild-type lipopolysaccharide when the lipid/protein ratio was low. However, contrary to the case of lipopolysaccharide, the lattice constant remained almost unchanged even when a larger amount of either lipid A or fatty acid was added to the reconstitution system. A slight increase in the lattice constant was observed only when an extremely large amount of lipid A was added to the reconstitution system. These results suggest that (1) both the lipid A moiety and the polysaccharide moiety of lipopolysaccharide participate in the interaction with the O-8 trimer, (2) in the lipid A moiety the fatty acid region primarily participates in the hexagonal arrangement of the O-8 trimer and the minimum requirement of lipopolysaccharide for the lattice formation is most probably one lipopolysaccharide molecule per O-8 trimer and (3) the polysaccharide moiety, probably both the 3-deoxy-d-manno-octulosonate region and the distal end region including heptose, are involved in an interaction of lipopolysaccharide with the O-8 trimer to give a proper lattice conformation." @default.
- W1990448060 created "2016-06-24" @default.
- W1990448060 creator A5080414839 @default.
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- W1990448060 date "1980-01-01" @default.
- W1990448060 modified "2023-09-26" @default.
- W1990448060 title "Interaction between Major Outer Membrane Protein (O-8) and Lipopolysaccharide in Escherichia coli K12" @default.
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- W1990448060 doi "https://doi.org/10.1111/j.1432-1033.1980.tb04305.x" @default.
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